w00t, what a thread! Finaly one that really interests me, even to the point where I couldn't drag myself away! My poor, poor pizza suffered tho... got burned...
Anyway, for a funny turn on things... This is how I've felt the game has been changing for me since the crystals came along...
I feel the crystals have given me more time to do other stuff...

(which I'm very happy about). With leveling in this game being alot slower than others, especially at higher levels I've often felt I needed to put alot of work in to leveling to feel any sense of accomplishment (not that this is bad), but for me it was just a bit too slow...
Using the crystals sometimes for me means, getting those few levels which I like to gain each day is faster and I've more 'free time' to go do other things I enjoy doing which don't involve grinding, such as:
Events,
Treks,
Boss hunts,
etc... aaand not forgetting
OP PvP battles which ofcourse are a time consuming side effect of having the Crystals... = )
So ofcourse, I'm cutting down the amount of time I level, but just raising the xp I gain. It's a nice balance I think, and thats why I like the crystals. = )
(Maybe they need a little adjusting, but what doesn't ; ) )